--- In [email protected], "John J. Riddell"
<[EMAIL PROTECTED]> wrote:
>
> David, the "Fix" for a Maggiore repeater working in to a
duplexer becoming a "comb generator"
> is to put a small antenna tuner between the TX and the duplexer.
> We fixed a problem here by doing that.
Tuning the transmitter fixes, filters mask.
Unfortunately without a spectrum analyzer, you'll never know it's in
comb mode. I've done this on three systems, two VHF and one 220,
and they all act about the same. Tune the TX for max output, and
you'll end up on or very near comb mode. Tune with an SA, and you
can see the comb mode go away, as well as another mode with lots of
noise within +/- 100 khz of the carrier go away, while getting to
the same output power.
> The "Z" matcher that was discussed on here while back would work
as well.
Possibly, it also acts as a filter to some extent.
The problems I am seeing are in the multiplier chain and many stages
isolate them from the output, so I doubt they are sensitive to load
impedance. There may also be spurs that you can get from the
finals too, NOTHING would surprise me in these things.
Yahoo! Groups Links
<*> To visit your group on the web, go to:
http://groups.yahoo.com/group/Repeater-Builder/
<*> To unsubscribe from this group, send an email to:
[EMAIL PROTECTED]
<*> Your use of Yahoo! Groups is subject to:
http://docs.yahoo.com/info/terms/
